These microcentrifuge spin cups and spin columns are convenient tools for manipulating small volumes of affinity supports (5 to 500μL) for immunoprecipitation (IP) and pull-down purification assays. Five styles of polypropylene columns and matching collection tubes offer a variety of options to suit particular types of experimental needs. Add the affinity resin and sample to one of the columns and use a microcentrifuge to efficiently wash away contaminants and elute your purified sample without losing any resin in the process. Spin columns allow you to affinity-purify more protein in less time.